inquisitor 18

[mad max]

have completed grid but cant get the preamble re 'eleven cells and four others' any clue or hint please
(posted before but no luck)

[cruciverbali]

Try to work out what 'D' could represent, and then why answers entered one way should be treated oppositely to those entered the other way.

Cruciverbalist

[mad max]

thanks very much for your help, have just seen central column, so all makes sense now (nothing to do with darts then) mm